A concise construction of polycyclic quinolines via intramolecular [2+ 2+ 2] annulation of ω- cyano-1-alkynes with diaryliodonium salts was realized. The process produced polycyclic quinolines in high yields with readily available staring materials and was tolerated with halogen substituents.
![9-Bromo-2,3-dihydro-1H-cyclopenta[b]quinoline Structure](https://image.chemsrc.com/caspic/063/18528-77-3.png)
![2,3-dihydro-1H-Cyclopenta[b]quinolin-9-amine Structure](https://image.chemsrc.com/caspic/025/18528-78-4.png)